Yarn finish applicator with internal finish heating capability

A yarn finish applicator for multifilament yarn comprising a body member providing a yarn contact surface including a slot with two side walls and a bottom, a metering pump for supplying a metered volume of heated finish from a heated finish supply to said applicator, a passage extending to an opening in said bottom of said slot through said body member so that finish supplied by said metering pump is supplied to said bottom of said slot and onto yarn passing through said slot by flowing through said passage, said bottom of said slot having a width such that the filaments of the yarn are splayed generally as a single layer as the yarn passes through said slot, and heating means in said body member for heating said finish in said passage as said finish flows to the yarn in said slot, said body member comprising a tip member providing said slot and a thermally conductive housing member attached to and supporting said tip member with said passage extending through said tip member and said housing member, said means for heating comprising at least one conduit in said housing and means for circulating a heated fluid through said conduit so that heat from said circulating fluid is transferred to said housing member to heat said finish in said passage, said heated fluid being circulated through said conduit being said heated finish from said heated finish supply.